i5>4- I^H, LEGE REFRACT. RAD. DIYERSIC. 



refr.Kflio media zz n .mzHm'- ^ 



m 



n — dn 



refni(ftio riibra ~ n— dn : m — dmzi 



m — d m 



tl 

 d m 



refradio \iolacca z:zn-\-dn : jn-^-dmz:}—^ '• i- 

 Ciim autem differcntiac dm ct dn tam fmt paruae 

 \t tanquam differentialia tradari poliint , cric pro- 

 xime : 



refradio rubra — ^, — </. ^ : i 



refradlio violacea —^-^-d.-: i. 



Hincquc refradio radiorum , quatcnus diuerfae funt 

 indolis , per mcdia diaphana quotcunque definiri po- 

 terit , fi modo rcfradio media cx aere in fiugula 

 ifta mcdia fuerit cognita. 



DE 



